Sixty thousand blacks are annually embarked from the coast of Guinea, never to return to their native country; but they are embarked in chains: and this constant emigration, which, in the space of two centuries, might have furnished armies to overrun the globe, accuses the guilt of Europe and the weakness of Africa.

The History of the Decline and Fall of the Roman Empire. The 2. Ed. - London, W. Strahan 1776-1788 (ed. 1781)